Researchers from the University of California, Los Angeles (UCLA), Washington University in St. Louis and the Los Angeles Biomedical Research Institute have discovered that acne bacteria, which thrive in the oily pores of skin, consist of “bad” strains associated with pimples and “good” strains that may protect the skin and keep it healthy. The finding may help dermatologists develop new, strain-specific treatments for acne. The research is published in the Journal of Investigative Dermatology.